Product Summary

The ACT4514 is a Wide-Input Sensorless CC/CV Step-Down DC/DC Converter. The ACT4514 is a wide input voltage, high efficiency ActiveCC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. The ACT4514 provides up to 1.5A output current at 210kHz switching frequency. ActiveCC is a patent-pending control scheme to achieve highest accuracy sensorless constant current control. ActiveCC eliminates the expensive, high accuracy current sense resistor, making it ideal for battery charging applications and high brightness LED drive for architectural lighting. The ACT4514 achieves higher efficiency than traditional constant current switching regulators by eliminating the sense resistor and its associated power loss. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency fold back at short circuit. The devices are available in a SOP-8 package and require very few external devices for operation. The applications of the ACT4514 include Car Charger, Rechargeable Portable Devices, General-Purpose CC/CV Power Supply.

Parametrics

ACT4514 absolute maximum ratings: (1)IN to GND: -0.3 to 40 V; (2)SW to GND: -1 to VIN + 1 V; (3)HSB to GND VSW: - 0.3 to VSW + 7 V; (4)FB, EN, ISET, COMP to GND: -0.3 to + 6 V; (5)Junction to Ambient Thermal Resistance: 105 ℃/W; (6)Operating Junction Temperature: -40 to 150 ℃; (7)Storage Junction Temperature: -55 to 150 ℃; (8)Lead Temperature (Soldering 10 sec.): 300 ℃.

Features

ACT4514 features: (1)Up to 40V Input Voltage; (2)Up to 1.5A Constant Output Current; (3)Output Voltage up to 12V; (4)2% Feedback Voltage Accuracy; (5)Up to 93% Efficiency; (6)210kHz Switching Frequency Eases EMI Design; (7)SOP-8 Package.

Diagrams

ACT4514 block diagram